(1)假设 竖纸盒 x 个,横纸盒 (100 - x) 个正方形纸：竖纸盒 = x,横纸盒 = 2 * (100 - x),一共 x + 2(100 - x) = 200 - x长方形纸：竖纸盒 = 4x,横纸盒 = 3 * (100 - x),一共 4x + 3(100-x) = 300 + x(2)正方形纸...